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SHARE-BASED COMPENSATION PLANS AND AWARDS Part 1 (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Document Period End Date | Dec. 31, 2019 |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price | $ 74 |  |
Share-based compensation expense recognized in selling, general and administrative expense | $ 59 | $ 64 | $ 52
Share-based compensation expense, retirement eligibility preceding the requisite vesting period | $ 3 | 3 | 2
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price | $ 80 |  |
Omnibus Long-Term Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Plan, term description | Eastman's 2017 Omnibus Stock Compensation Plan ("2017 Omnibus Plan") was approved by stockholders at the May 4, 2017 Annual Meeting of Stockholders and shall remain in effect until its fifth anniversary. |  |
Shares reserved and available for issuance (in shares) | 10,000,000 |  |
Shares covered by full award value per share available for issuance | $ 2.5 |  |
Grant date exercise price, minimum | exercise price not less than 100 percent of the per share fair market value on the date of the grant |  |
Director Compensation Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved and available for issuance (in shares) | 10,000,000 |  |
Term of service for shares of restricted stock to be granted to a non-employee director | Shares of restricted stock are granted on the first day of a non-employee director's initial term of service and shares of restricted stock are granted each year to each non-employee director on the date of the annual meeting of stockholders. |  |
Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense recognized in selling, general and administrative expense | $ 9 | $ 9 | $ 8
Weighted average assumptions used to determine fair value of stock options awarded [Abstract] |  |  |
Expected volatility rate (in hundredths) | 19.80% | 19.03% | 20.45%
Expected dividend yield (in hundredths) | 2.51% | 2.48% | 2.64%
Average risk-free interest rate (in hundredths) | 2.44% | 2.61% | 1.91%
Expected term years (in years) | 5 years 8 months 12 days | 5 years 1 month 6 days | 5 years
Expected dividend yield calculation basis | Company's average of the last four quarterly dividend yields |  |
Summary of activity of stock option awards [Roll Forward] |  |  |
Outstanding at beginning of period (in shares) | 2,905,600 | 2,614,100 | 2,363,700
Granted (in shares) | 786,000 | 619,700 | 745,800
Exercised (in shares) | (135,700) | (323,000) | (489,300)
Cancelled forfeited or expired (in shares) | (76,600) | (5,200) | (6,100)
Outstanding at end of period (in shares) | 3,479,300 | 2,905,600 | 2,614,100
Options exercisable at period-end (in shares) | 2,077,600 | 1,606,800 | 1,335,500
Available for grant at end of period (in shares) | 6,085,857 | 8,174,614 | 9,943,033
Outstanding at beginning of period (in dollars per share) | $ 79 | $ 70 | $ 61
Granted (in dollars per share) | 81 | 104 | 80
Exercised (in dollars per share) | 67 | 55 | 44
Cancelled, forfeited, or expired (in dollars per share) | 88 | 78 | 74
Outstanding at end of year (in dollars per share) | 80 | 79 | 70
Weighted average fair value of options granted (in dollars per share) | $ 13.12 | $ 15.90 | $ 11.79
Intrinsic value of options exercised | $ 2 | $ 15 | $ 19
Cash proceeds received from option exercises | 9 | 18 | 22
Tax benefit of options exercised |  | 3 | 5
Fair value of shares vested | $ 8 | $ 7 | $ 6
Stock Option [Member] | Director Compensation Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term life of options (in years) | P10Y |  |
Vesting periods, maximum (in years) | 3 years |  |
Nonvested Options [Member] |  |  |
Summary of activity of stock option awards [Roll Forward] |  |  |
Outstanding at beginning of period (in shares) | 1,298,800 |  |
Granted (in shares) | 786,000 |  |
Vested (in shares) | (608,200) |  |
Cancelled forfeited or expired (in shares) | (74,900) |  |
Outstanding at end of period (in shares) | 1,401,700 | 1,298,800 |
Outstanding at beginning of period (in dollars per share) | $ 13.63 |  |
Granted (in dollars per share) | 13.12 |  |
Vested (in dollars per share) | 12.89 |  |
Cancelled, forfeited, or expired (in dollars per share) | 13.43 |  |
Outstanding at end of year (in dollars per share) | $ 13.68 | $ 13.63 |
Unrecognized compensation expense before tax for these same type awards | $ 5 |  |
Amortization life of unrecognized compensation expense before tax for these same type awards (in years) | 2 years |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 189,000 | 160,000 | 172,000
Other Share-Based Compensation Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense recognized in selling, general and administrative expense | $ 50 | $ 55 | $ 44
Summary of activity of stock option awards [Roll Forward] |  |  |
Unrecognized compensation expense before tax for these same type awards | $ 55 |  |
Amortization life of unrecognized compensation expense before tax for these same type awards (in years) | 2 years |  |
Performance Shares [Member] | Long term performance shares award 2017-2019 cycle [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 357,000
Performance Shares [Member] | Long term performance shares award 2018-2020 cycle [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 310,000 |
Performance Shares [Member] | Long term performance shares award 2019-2021 cycle [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 412,000 |  |

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- Definition Shares covered by full value (e.g., performance shares and restricted stock awards) are counted against the total number of shares available for issuance based on delivery under the plan as this number of shares for every available under the award. + References No definition available. + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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